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Minolta DSLR-Thinking of buying Minolta 5d digital SLR camera. Is the autofocus fast enough?

Hi all, I have a number of old 35mm SLR autofocus bodies - 3xi, 5xi, 7000 with a number of lenses: 70-200 f2.8 sigma zoom, 400mm f5.6 sigma telephoto lens, and I am planning to buy a Minolta 5D SLR. I really would like to use these lenses on a 5D SLR body, I know it is possible, BUT I would like some feedback on people who have, or have used the new Minolta 5D. Is the autofocus fast enough?? I take a lot of sport photos: rugby, hockey etc, as well as low light concert photograpy. Can the camera handle the pace??? I would appreciate any feedback. Many thanks!!!